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Wysocki" , Len Brown , Maximilian Luz , Lee Chun-Yi , "Shyam Sundar S K" , Corentin Chary , "Luke D . Jones" , Ike Panhc , Henrique de Moraes Holschuh , "Alexis Belmonte" , =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= , Ai Chao , Gergo Koteles , open list , "open list:ACPI" , "open list:MICROSOFT SURFACE PLATFORM PROFILE DRIVER" , "open list:THINKPAD ACPI EXTRAS DRIVER" , Mark Pearson , Matthew Schwartz , Mario Limonciello Subject: [PATCH v6 22/22] Documentation: Add documentation about class interface for platform profiles Date: Fri, 8 Nov 2024 22:41:51 -0600 Message-ID: <20241109044151.29804-23-mario.limonciello@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241109044151.29804-1-mario.limonciello@amd.com> References: <20241109044151.29804-1-mario.limonciello@amd.com> Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: SATLEXMB04.amd.com (10.181.40.145) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SN1PEPF00026369:EE_|IA0PR12MB8974:EE_ X-MS-Office365-Filtering-Correlation-Id: a2a6b79b-46fd-4b88-55ce-08dd0078fddb X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; ARA:13230040|36860700013|7416014|376014|1800799024|82310400026; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17; CTRY:US; LANG:en; SCL:1; SRV:; IPV:CAL; SFV:NSPM; H:SATLEXMB04.amd.com; PTR:InfoDomainNonexistent; CAT:NONE; SFS:(13230040)(36860700013)(7416014)(376014)(1800799024)(82310400026); DIR:OUT; SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Nov 2024 04:43:01.0782 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: a2a6b79b-46fd-4b88-55ce-08dd0078fddb X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d; Ip=[165.204.84.17]; Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SN1PEPF00026369.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA0PR12MB8974 The class interface allows changing multiple platform profiles on a system to different values. The semantics of it are similar to the legacy interface. Tested-by: Mark Pearson Signed-off-by: Mario Limonciello --- v5: * Fix some typos --- .../ABI/testing/sysfs-platform_profile | 5 ++++ .../userspace-api/sysfs-platform_profile.rst | 28 +++++++++++++++++++ 2 files changed, 33 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-platform_profile b/Documentation/ABI/testing/sysfs-platform_profile index baf1d125f9f83..125324ab53a96 100644 --- a/Documentation/ABI/testing/sysfs-platform_profile +++ b/Documentation/ABI/testing/sysfs-platform_profile @@ -33,3 +33,8 @@ Description: Reading this file gives the current selected profile for this source such as e.g. a hotkey triggered profile change handled either directly by the embedded-controller or fully handled inside the kernel. + + This file may also emit the string 'custom' to indicate + that multiple platform profiles drivers are in use but + have different values. This string can not be written to + this interface and is solely for informational purposes. diff --git a/Documentation/userspace-api/sysfs-platform_profile.rst b/Documentation/userspace-api/sysfs-platform_profile.rst index 4fccde2e45639..b746c30432753 100644 --- a/Documentation/userspace-api/sysfs-platform_profile.rst +++ b/Documentation/userspace-api/sysfs-platform_profile.rst @@ -40,3 +40,31 @@ added. Drivers which wish to introduce new profile names must: 1. Explain why the existing profile names cannot be used. 2. Add the new profile name, along with a clear description of the expected behaviour, to the sysfs-platform_profile ABI documentation. + +Multiple driver support +======================= +When multiple drivers on a system advertise a platform profile handler, the +platform profile handler core will only advertise the profiles that are +common between all drivers to the ``/sys/firmware/acpi`` interfaces. + +This is to ensure there is no ambiguity on what the profile names mean when +all handlers don't support a profile. + +Individual drivers will register a 'platform_profile' class device that has +similar semantics as the ``/sys/firmware/acpi/platform_profile`` interface. + +To discover available profiles from the class interface the user can read the +``choices`` attribute. + +If a user wants to select a profile for a specific driver, they can do so +by writing to the ``profile`` attribute of the driver's class device. + +This will allow users to set different profiles for different drivers on the +same system. If the selected profile by individual drivers differs the +platform profile handler core will display the profile 'custom' to indicate +that the profiles are not the same. + +While the ``platform_profile`` attribute has the value ``custom``, writing a +common profile from ``platform_profile_choices`` to the platform_profile +attribute of the platform profile handler core will set the profile for all +drivers.